#include <iostream>
using namespace std;
int main()
{
    int n;    cin >> n;
    int arr[2*n];
    int metr = 0;
    for ( int i = 0 ; i < n*2 ; i ++ )
    {
        cin >> arr[i];
        for ( int j = 0 ; j < i ; j ++ )
        {
            if ( i > 0 && arr[i] == arr[j] )
            {
                metr += abs(i - j);
            }
        }
    }

    cout << metr;


    return 0;
}